CIS-lambda frequency valve question

[jdbubb at ix.netcom.com (Dan Bubb)]

WOT enrichment is only 65% IIRC, so going to a constant 12V would be way rich.
For reference, cold running enrichment is 85% again, IIRC.
Pretty sure I'm in the ballpark with the above numbers.

  ----- Original Message ----- 
  From: Drew MacPherson 
  To: scirocco-l@scirocco.org 
  Sent: Friday, October 24, 2003 1:11 PM
  Subject: CIS-lambda frequency valve question



  I've got a couple of questions about the frequency valve on the
  K-jetronic-lambda implementation (what's on the JH engine in Sciroccos)

  The frequency valve is controlled by the k-jet control box based on input 
  from the O2 (lambda) sensor which indicates rich or lean running.  By 
  increasing the duty cycle on the valve the mixture is enriched, by 
  decreasing the duty cycle the mixture is leaned out.  When the full 
  throttle switch is closed (JH engine) the control module increases duty 
  cycle on the vavle to "near" 100% (according to Watson's BOSCH fuel 
  injection book.

  What I want to know is a) is the voltage to the frequency valve 12V or 5V, 
  and b) will the valve operate reliably for short periods when a constant 
  voltage (ie 12V or 5V) is applied, rather than a fluctuating voltage as 
  applied by the K-Jet box.

  I'm looking for full throttle enrichment for my winter beater (87 Jetta,)  
  which is running stock CIS (ie no lambda.) If I use a stock JH fuel
  distributor, and wire the full throttle switch to supply 12V (or 5V) to
  the frequency valve, then I should (in theory) get full throttle
  enrichment, without having to worry about wriing in the K-jet control box
  and O2 sensor (which I have less than zero desire to do.)

  Any (pertinent!) information would be appreciated... :)

  Drew

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